Like the previous Legacy Collections, Zero/ZX Legacy Collection includes both the Japanese versions and the North American versions of each game. The gallery from the 2010 Mega Man Zero Collection is also included, along with several new features. Zero/ZX Legacy Collection adds an optional checkpoint system, which can be enabled to save the player's progress in each stage, along with a new "Casual Scenario" mode, which reduces the difficulty and adds additional assists. Another new mode, "Z Chaser", tasks players with finishing levels as quickly as possible.[11] Additionally, a new "Link Mode" was added for ZX to recreate the original release's ability to connect to Zero 3 and Zero 4 via the DS's GBA slot; by choosing which game to link to before starting play, players can battle four additional bosses from each game.[12]